Redirect.cs

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/*
  Copyright (C) 2002-2010 Jeroen Frijters
 
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.
 
  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
 
  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
 
  Jeroen Frijters
  jeroen@frijters.net
  
*/
 
using System;
using System.Xml.Linq;
 
using IKVM.Reflection;
using IKVM.Reflection.Emit;
using IKVM.Runtime;
 
using Type = IKVM.Reflection.Type;
 
namespace IKVM.Tools.Importer.MapXml
{
 
    public sealed class Redirect : MapXmlElement
    {
 
        public static Redirect Read(XElement element)
        {
            var redirect = new Redirect();
            Load(redirect, element);
            return redirect;
        }
 
        public static void Load(Redirect redirect, XElement element)
        {
            Load((MapXmlElement)redirect, element);
            redirect.Class = (string)element.Attribute("class");
            redirect.Name = (string)element.Attribute("name");
            redirect.Sig = (string)element.Attribute("sig");
            redirect.Type = (string)element.Attribute("type");
        }
 
        public string Class { get; set; }
 
        public string Name { get; set; }
 
        public string Sig { get; set; }
 
        public string Type { get; set; }
 
        internal void Emit(RuntimeClassLoader loader, CodeEmitter ilgen)
        {
            if (Type == null && Class == null)
                throw new NotImplementedException();
            if (Name == null || Sig == null)
                throw new NotImplementedException();
 
            var redirParamTypes = loader.ArgTypeListFromSig(Sig);
            for (int i = 0; i < redirParamTypes.Length; i++)
                ilgen.EmitLdarg(i);
 
            // HACK if the class name contains a comma, we assume it is a .NET type
            if (Type != null)
            {
                var type = loader.Context.Resolver.ResolveCoreType(Type).AsReflection();
                var mi = type.GetMethod(Name, redirParamTypes);
                if (mi == null)
                {
                    throw new InvalidOperationException();
                }
                ilgen.Emit(OpCodes.Call, mi);
            }
            else
            {
                var tw = loader.LoadClassByName(Class);
                var mw = tw.GetMethod(Name, Sig, false);
                if (mw == null)
                {
                    throw new InvalidOperationException();
                }
                mw.Link();
                mw.EmitCall(ilgen);
            }
 
            // TODO we may need a cast here (or a stack to return type conversion)
            ilgen.Emit(OpCodes.Ret);
        }
 
    }
 
}